-This is the modified version of my previous uploads.
-A friend of me modified the recording and he believes that this song is belongs to Locustella fluviatilis. However, some songs of Locustella naevia look kind of similar to this record for me and I am not exactly sure.
--Singing inside a bush in a thick vegetation and didn't show himself even though I waited for more than an hour.
-Records of Locustella fluviatilis (River Warbler) is very rare in Turkey but Locustella naevia (common grasshopper warbler) is extremely rare.
-I appreciate for your help to identify this song. Thanks.